Trump and O'Donnell have made their mutual disdain for one another quite clear, engaging in multiple Twitter feuds and publicly denouncing each other on television and through YouTube videos.

Trump was seemingly responding to O'Donnell's scathing attack from Wednesday night. O'Donnell said that GOP candidate Mitt Romney knows that Trump is a "buffoon" and "America's biggest loser." He also said that Romney would never appoint Trump as a cabinet member if he were President, and wouldn't allow Trump to wash his car either.

Trump responded by criticizing O'Donnell's MSNBC show for having "bad ratings" and being "completely irrelevant." He also said that O'Donnell's show would be "completely dead" without him. According to Trump, O'Donnell "desperately" needs to discuss him to "get attention."

Lawrence O'Donnell will soon have another cancelled show to go along with his three cancelled TV series, "Mister Sterling", "The Kill Point" and "First Monday". @lawrence is a poor man's Ed Schultz (who replaced @Lawrence) and Al Sharpton. He was moved to 10PM due to bad ratings and taken off Friday due to being totally irrelevant. He desperately needs to keep making up false statements about me to get attention. Without clips of me, his show would be completely dead and he knows it. As I have said many times before @Lawrence is the dumbest man on television. He is only angry because I would never have wasted my time doing his completely irrelevant show.